Files with xpi extension can be commonly encountered as various Firefox plugins or add-on files. Add-ons enhance current features of the browser or add completely new functions or mini programs to the program (such as weather forecast, dictionary, password storage etc.).

Detailed description

Software that open xpi file

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XPI file extension - Firefox browser extension

What is xpi file? How to open xpi files?

File type specification:

Plugin, addon file type icon Plugin, addon file type

xpi file icon: xpi filetype icon

File extension xpi is associated with Firefox or Mozilla web browsers and used for its plugins and add-ons.

The XPI archive contains: installation settings (.rdf file extension), Manifest file (.manifest file extension), graphics files (.png, .jpg, .gif), and other data stored in .css, .js files. This is basically a ZIP file that, when opened by the Firefox browser utility, installs a browser extension. This extension applies to both Mozilla and Firefox browsers.

Other web browsers based on Firefox Gecko core, such as Seamonkey, use extensions in .xpi containers. However not all Firefox extensions are compatible with other Gecko based browsers.

MIME type used for xpi firefox plugins: application/x-xpinstall

What are Firefox extensions or Firefox Add-ons?
Firefox add-ons are small pieces of software that can add new features or tiny tweaks to customize your Firefox browser. They can add new search engines or dictionaries in other languages, change the whole look of Firefox with a new theme, or much much more. Take a look around and see what add-ons can do for you.

See related links to open Firefox addons website.

Updated: November 16, 2023

The default software associated to open xpi file:

Firefox icon

Mozilla Corporation logoFirefox  Microsoft Windows software

Company or developer:
Mozilla Corporation

Firefox is very popular free open source web browser with many features. Firefox uses Gecko layout engine that implements most web standards including new HTML5.

Firefox supports tabbed browsing, private browsing, spell checking, incremental find, bookmarking etc. Other features can be added via extensions and add-ons, such as NoScript, Tab Mix Plus. FoxyTunes, Web Developer.

Related articles:

Featured add-ons for Firefox

Help how to open:

The XPI Firefox browser extension file is the native format, that is used by Mozilla Firefox to installation of browser extensions.

The XPI Firefox browser extension file is ZIP archive with renamed file extension to XPI. You can rename XPI file extension to ZIP and file can be opened in compression utilities, that can open ZIP archive, such as WinRAR, WinZip, PeaZip, 7-zip and etc.

How to convert:

There is no way how to convert the XPI Firefox browser extension file in to other file format.

Find conversions from xpi file:

xpi to crx

xpi to zip

Find converter to xpi file type:

crx to xpi

zip to xpi

File identification strings:

HEX code: 50 4B 03 04
ASCII code: PK

Related links:

Firefox add-ons website

List of recommended software applications associated to the .xpi file extension

Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open xpi file, edit xpi file, convert xpi file, view xpi file, play xpi file etc. (if exist software for corresponding action in's database).

Software that import xpi file - Firefox browser extension

Programs supporting the exension xpi on the main platforms Windows, Mac, Linux or mobile. Click on the link to get more information about listed programs for import xpi file action.

Microsoft Windows:

Main software associated with xpi file by default:
Firefox small icon Firefox
Other suggested software:
SeaMonkey small icon SeaMonkey
Mozilla Thunderbird small icon Mozilla Thunderbird

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